無電解コバルト-ニッケルおよびコバルト-ニッケル-リン合金メッキ膜の磁気特性

Abstract

The authors investigated the relationship between the magnetic properties and crystal structures or compositions of Co-Ni and Co-Ni-P plating films chemically deposited from 4 kinds of the baths reported in the previous papers.The results obtained were summarized as follows.1) In general, maximum flux density, remanent flux density, squareness, and coercive force of the films were decreased with the increase of nickel content in the films. However, the decreasing tendency was different among the types of baths, from which the films were deposited.2) The film deposited had higher squareness and smoother surface when the plating bath was more stable. The decreasing order of baths for depositing films of high squareness was arranged as follows:A-C-9>C-C-7>A-T-9>hydrazine.3) The structures of films deposited from different types of baths were different one another, even though they had the same alloy composition. It can be explained by the differences in metallic ions in the baths (stability and reactivity of complexes) and phophorus contents of the films.4) The films composed of fine crystal grains were deposited from the bath of high stability (containing highly sequestered metallic ions). The size of these grains is related with the magnetic properties of the films.